Artificial arm.



A. K. PETRON.

ARTIFICIAL ARM.

APPLICATION FILED 001. 21, ms.

Patented Apr. 8, 1919. 2 SHEETS-SHEET I FIG. 1

A. K. PETRON.

ARTIFICIAL ARM.

APPLICATION FILED OCT. 21. I918.

Patented Apr. 8, 1919.

2 SHEETS-SHEET 2.

FIG. 11.

FIG. 10.

llllllllllllllllllllll a Ill/l FIG. 12. FIG. 13.

vwamtoz Juli; WZrol n/ TATE PANT FFI ARTIFICIAL ARM.

Application filed October 21, 1918. Serial No. 258,978.

, provision of an artificial arm which is readily attached to the bodyof a person such as a soldier for use in place of an arm which has beensevered.

A further object of the invention is to pro- I vide an artificial armhaving jointed finger members provided with finger nails, theconstruction'being such that vthe elbowjoint of the arm is resilientlymaintained outstretched capable of being readily bent when desired,suitable weight and rigidity being also imparted to the member which hasa general appearance of a human arm and hand.

With these general objects in view the device consists of thecombination and arrangement of parts hereinafter more fully describedand illustrated in the accompanying drawings in which like referencecharacters designate corresponding parts throughout the several views.

1n the drawings,

Figure 1 is a central longitudinal sectional view through the inventionwith a portion of the attaching means therefor illustrated in elevation,

Fig. 2 is a transverse sectional view taken ghrough the upper armuponline IIII of Fig. 3 is a similar detail sectional view upon a differentline of section from that shown in Fig. 2,

Fig. 4 is a vertical longitudinal detail iectional view taken upon line1VIV of Fig. 5 is a perspective view of a portion of the upper part ofthe skeleton member or frame of the upper arm,

Fig. 6 is a side elevation of the skeleton or frame for the arm,

' Fig.- 7 is a rear elevation thereof,

Fig. 8 is an enlarged view of a portlon'of the same with the hinged'joint shown in section,

Fig. 9 is'a perspective view of a brace employed with the frame,

Specification of Letters Patent.

Patented Apr. 8, 1919.

Fig. 10 is a view illustrating one complete arm with the manner ofattaching the same to the body,

Fig. 11 is a similar view of a pair of arms,

Fig. 12 is a rear elevation of a portion of one of the finger membersand Fig. 13 is a central longitudinal sectional view thereof. v

Referring more in detail to the drawings, the skeleton work for the armincludes an upper frame having side bars 10 hin ed to the similar sidebars 11 of a lower rame, the said frames forming the inner members forthe upper and lower arms with a pintle l2 connecting the same togetherserving as an elbow joint. A spring 13 encircles the pintle 12 with itsopposite ends secured as at 14 to the upper and lower frames, wherebythe frames are normally maintained outstretched as best illustrated inFigs. 1, 6 and 7 of the drawings. A hand member 15 is pivoted as at 16to the lower free ends of the forearm bars 11, a plurality of fingerjoints 17 as well as a jointed thumb projecting therefrom. A cross plate19 is pivotally connected between inwardly extending lugs 20 adjacentthe upper ends of the upper bars 10, the extreme upper ends of whichbars are I beveled as at 21 upon their inner sides.

A closely coiled helical spring 22 encircles the upper frame secured tothe side bars 10 thereof by means of oppositely positioned braces 23 inthe form illustrated in Fig. 9 of the drawings, screws 24 extendingthrough the braces 23 and into the adjacent portions of the bars 10 forholding the members together.

In a similar manner, formed. of resilient wire, closely coiled into aslightly tapered casing 25 surrounds the lower arm being attached byscrews 24 to a helical spring the lower bars 11 in a similar manner, itbeing understood that the casings 22 and 25 are of similar taperedconstruction giving the general form of an arm member to the structure.

An envelop or covering 26 of flexible material' and preferably-of aslightly resilient form of rubberized or other suitable material isdrawn over the casings 25 and 22 with a hand portion 27 of the coveringin the form of a glove closely fitting the hand 15 with its fingers 17and thumb 18 of the skeleton structure. A suitable filling 28 of suchmaterial as coiled or tangled wire, metallic hair or other material ispacked or padded as a lining between the covering 26 and the casings 25and 22 giving the appearance and form of a lower and upper arm.

An attaching collar or jacket 29 of the same material as the covering 26is provided at the upper end thereof for encircling the shoulders of thewearer being secured by means of suitable lacing 30 and when only oneartificial arm is employed, having an open arm-hole 31 at one sidethereof for receiving the arm of the wearer therethrough.

hen the jacket is positioned upon the person, the shoulder portion orstump of the arm is to be seated upon the plate 19 of the upper armframework between the beveled portions 21 of the bars 10 and by movingthis stump portion, the artificial arm may be swung around as founddesirable.

lVhen the elbow portion is bent manually by the wearer, the spring 13will normally return the arm to its outstretched position when released.Terminal plates 32 are provided at the ends of the finger portions ofthe glove 27 serving as or giving the appearance of finger nails to theartificial digits.

Where two artificial arms are provided in this manner as illustrated inFig. 11 of the drawings, the jacket portion 29 is attached to both ofthe arms as 26 and 26 while the acket is being secured around the neckand upon the shoulders of the wearer,

both arms are secured in their operative po= sitions.

The material of which the covering 26 is formed is such as to bewater-proof so as to be washed whenever desired and the color thereofmay be that of human flesh for presenting the appearance of the naturalarms.

What I claim as new is 7 An artificial arm comprising an upper frameformed of side bars, a lower frame having side bars hinged to the sidebars of the upper frame, spring connections between said frames wherebythe latter are normally maintained outstretched, inwardly projectinglugs spaced from the upper ends of the bars of the upper frame, a plateconnecting the said lugs, the upper ends of the bars of the upper framebeing beveled adapted for the reception of the stump of an armtherebetween for seating upon said plate, a hand member pivoted to thelower end of the lower frame, closely coiled springs encircling theupper and the lower frames, securing means between the said springs andframes, a resilient packing surrounding the said springs, an envelopcovering said packing with a' glove portion surrounding the said hand,and a jacket attached to said envelop adapted for attachment to thehuman body.

In testimony whereof I afiix my signature.

ANTHONY K. PETRON.

